The Sensi app takes all of the frustration and guesswork out of thermostat installation. Just tell the app which wires are connected to your old thermostat, and it chooses from hundreds of possible configurations to select the one that matches your home exactly. Even if you’re installing a thermostat for the first time, we have you covered. Clearly illustrated, step-by-step instructions will confidently guide you through installation from start to finish. Should you need any help along the way, our highly trained technical support team is just a phone call away, seven days a week.